Cleaning Fuel Injectors

[Mango]

1989 350, 194,000 miles origional injectors, spray pattern looks good, runs good, gas millage not great! Can or should I clean the TBI in a Ultrasonic Cleaner? and replace gaskets?

 

[gmbellew]

I'd run your favorite fuel system cleaner through the gas tank and not worry too much about it.

The gas mileage wasn't great to begin with.

My 1990 4x4 burb 350tbi is no spring chicken with 235k miles, but I keep things well tuned up and maintained. I get 12.5-13.5mpg generally cruising at 73-74mph (as long as it isn't really windy) with tires that are about a measured 32in with 3.73 gears. City driving is 10-11mpg.

If you want much better than that, drive 55mph like the speed limit was when the truck was made

 

[TotalyHucked]

Define gas mileage not being great. If the fuel spray pattern is nice and the engine runs smooth with no smoking or bucking/sputtering, I wouldn't touch it. Maybe run some injector cleaner in the next tank, I run B12 Chemtool through all my vehicles a couple times a year

 

[Matt69olds]

If it ain’t broke, don’t fix it.

I don’t have much confidence in the injector cleaner in a can. Anyone who has tried to remove carbon deposits from valves with a wire wheel knows how difficult that can be. If a wire wheel on a grinder takes a while to remove carbon, what good will cleaner in a can do?

 

[Scott91370]

You can't clean fuel injectors in this section, it's the carb'd section.

 

[Mango]

Just Cleaned the TBI with Spray cleaner and Installed New Plugs AC Delco CR43TS and one Bottle Chevron Techron fuel system cleaner with the fuel tank almost empty.
Runs so much better I think its the Plugs ?

 

[Mango]

Should I pull the Injectors out and clean them in a Ultrasonic tank ?

 

[Grit dog]

You’re searching for a solution to a problem you don’t have.
If your 36 year old TBI system is working great, why mess with it. Just wait. Something will need replaced at some point but doesn’t sound like that’s now.
As for fuel mileage? lol If the plugs weren’t showing rich and it’s not running rough or rich or any other fuel related issues or symptoms, your fuel mileage is right where it should be.
Spitballing but I’d guess 12mpg ish is a good number for a 4wd brick from the previous century. Depending how you drive it. 65mph with the cruise on, flat, no headwind it should be a bit better. Around town, 10-12?

 

[Mango]

Doug you use top tier fuel or is that a gimmick